Cake Talk by Jack Birkin
Dusty star-forming galaxies (DSFGs) at z~1-4 are a vital piece in the puzzle of galaxy formation/evolution. Their enormous star-formation rates, typically 100-1000 solar masses per year, enable strong constraints on models of galaxy formation and evolution. Significant progress in the study of DSFGs has been made over the last decade, largely thanks to ALMA - however optical studies, particularly resolved ones, are generally lacking due to the heavy dust obscuration that this population experiences at optical wavelengths. To address this - I will present results from two of our recent rest-frame optical IFU studies of DSFGs. The first is a ~240 hour large programme with VLT/KMOS to investigate DSFG kinematics through resolved observations of their H-alpha emission. Our sample of z~1.3-2.6 DSFGs appears to show rotationally supported kinematics, with v/sigma>1.5 in around 60% of sources. Despite this, the DSFGs display high levels of turbulence which could be a result of ongoing interactions, or may be driven by star formation itself. Secondly, I will present resolved JWST/NIRSpec maps of the [NII]/H-alpha ratio in two z~4 DSFGs, a critically important tracer of the gas-phase metallicity which was inaccessible at these redshifts in the pre-JWST era. The maps indicate high levels of metal enrichment, likely as a result of the extremely rapid star formation in these explosive yet elusive galaxies.